Thermodynamic properties of the Na2O-BaO-B2O3 glasses and melts
Source abstract
Abstract
The glass formation region in the system Na 2O-BaO-B 2O 3 has been established. Thermodynamic properties for this system were derived. It is found that the lower border of glass formation region is limited to composition containing 10–30 mol.% Na 2O, 10–30 mol.% BaO and 60 mol.% B 2O 3. A region with partial crystallization has been found inside the glass formation region. This region is limited to compounds 5 Na 2O-20 BaO-75 B 2O 3 mol.% and 10 Na 2O-20 BaO-75 B 2O 3 mol.%. The vaporization processes and thermodynamic properties of the Na 2O-BaO-B 2O 3 melts were investigated by the Knudsen effusion mass spectrometry in the temperature range 1290–1750 K. The values of the component activities, Gibbs energies and excess Gibbs energies were derived from experimental data. It was shown that the studied system is characterized by a negative deviation from the ideal behavior.
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Research context
OpenAlex topics: Glass properties and applications · Thermal and Kinetic Analysis · Luminescence Properties of Advanced Materials
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